The hiring for international schools is year-round, and very fluid.
While most hires are made between January and March (for jobs to start in August), there is a lot of recruitment that occurs outside this peak period.
There are also a number of schools running on the southern hemisphere calendar (January-November), or schools that have emergency recruitment needs.
If you are signing up within the peak months (December-March), we would expect you to receive matches/opportunities reasonably quickly.  If you are signing up before or after these months, it might take a little bit more time to find the right opportunity.